1. The problem statement, all variables and given/known data The length of a string attached to a pendulum is measured with a precision of (+or-)0.2. The time of the oscillation is measured to a precision of (+or-)0.1. How many periods must you measure so that the contribution of the uncertainty in time is smaller than the uncertainty in length, when calculating g? 2. Relevant equations T=2pi(l/g)^(1/2) 3. The attempt at a solution g=((2pi)^2(l+delta:l))/(T+delta:T)^2 I dont know where to go from here. Delta l and T are the error in those measurements.